introduced scalaHome parameter and scala.home property
addCompilerToClasspath
addLibraryToClassPath
Merge branch '2.15.3-scala-home' of git://github.com/mephi42/maven-scala-plugin into mephi42-2.15.3-scala-home

Conflicts:
	src/main/java/scala_maven/ScalaConsoleMojo.java
	src/main/java/scala_maven/ScalaMojoSupport.java
fix compile
refactor to allow zinc to use scalaHome
remove useless args
fix warnings : missing @Override, useless import
update one deprecated call
revert breaking change
update doc